| Abstrakt: |
One of the most promising directions in the field of development of new metallic materials with a high level of heat resistance and thermal stability is development of intermetallic alloys of Ti-Al system. In the near future these alloys can create serious competition to nickel-based superalloys, as titanium aluminides are lighter and do not require expensive and deficit elements for alloying. In addition, they have a high corrosion resistance, high-temperature oxidation resistance, and also have a high modulus of elasticity and strength. Titanium aluminides can be successfully applied in the form of cast products, for instance of valves of super-power internal combustion engines; as high-temperature resistant coatings on gas turbine blades, exposed to high-temperature gas flows; as structural material operating at static loads and high temperatures. Wide industrial application of titanium aluminides is hindered by their low ductility at room temperature. This greatly complicates technological processing and slows down industrial application of the above alloys. Therefore, application of titanium aluminides in various-purpose structures is dependent on development of effective technologies of their processing, including welding. In this connection the purpose of this review is analysis of currently available developments of joining processes for titanium aluminide based materials by various kinds of welding. Analysis of published data given in the review showed that formation of welded joints with application of traditional welding processes based on local melting of material has several drawbacks, which can be eliminated at application of various solid-phase welding processes. Results given in the publications, are indicative of the good prospects for application of intermediate inserts for joining difficult-to-weld titanium aluminide based alloys. [ABSTRACT FROM AUTHOR] |
